fix(VBreadcrumbs): fix types for slots

[SonTT19]

Description

fixes #19339

Markup:

<template>
  <v-app>
    <v-container>
      <!-- proof that `title` exists on `item` -->
      <v-breadcrumbs :items="['foo', 'bar']">
        <template #item="{ item }">{{ item }}</template>
      </v-breadcrumbs>

      <!-- renders as expected but causes ts error -->
      <v-breadcrumbs :items="['foo', 'bar']">
        <template #item="{ item }">{{ item.title }}</template>
      </v-breadcrumbs>

      <!-- explicitly creating the item object fixes the error -->
      <v-breadcrumbs :items="['foo', 'bar'].map((entry) => { return { title: entry } })">
        <template #item="{ item }">{{ item.title }}</template>
      </v-breadcrumbs>
    </v-container>
  </v-app>
</template>

<script setup lang="ts">
  import { ref } from 'vue'

  const msg = ref('Hello World!')
</script>